SYNTHESIS OF HETEROCYCLES
247
IV.E-12 Panek, J.S. et al., TU 35, 6453; Taber, D.F. et al., /OC, 59,
3442; see also: Galatsis, P. et al., JOC, 59, 6643; Horita, K., Yonemitsu,
O. et al., SL, 40; da Silva, G.V.J., Pelisson, M.M.M. and Constantino,
M.G., 7L, 35, 7327; Tiecco, M. et al., SL, 373; Andersson, P.G. and
Aranyos, A., 7X, 35, 4441.
SiMe 2 Ph
similar cyclizations induced by I 2 , Se, or Pd
PhMe 2 Si^
or VO(II), TBHP
γ^Τ"θ
ArC0 3 H
OH
20-81%
6:1 to 30:1 syn: anti
IV.E-13 Wasserman, H.H. and Lee, G.M., TL, 35, 9783; see also:
Solladie, G. and Dominquez, C , JOC, 59, 3898.
R
ORj
Oxone
R,
X)
OH
PPh,
68-95%
IV.E-14 Kang, K.T., SC, 24, 2915; see also: Kel'in, A.V. and
Kulinkovich, O.G., JOU, 30, 202; Dong, Y. et al., TL, 35, 9367.
XJ<°
LDA
or nBuLi
50-85%
TMS